Mount Leinster () is a mountain in the Republic of Ireland. It straddles the border between Counties Carlow and Wexford, in the province of Leinster. It is the fifth-highest mountain in Leinster after Lugnaquilla , Mullaghcleevaun , Tonelagee , and Cloghernagh , and the highest of the Blackstairs Mountains. A 2RN transmission site tops the peak with a mast height of . Summit access The mountain is most often climbed from the Nine Stones, a landmark point at the foot of Mount Leinster, about 8 miles east of Borris. From Borris there is a road to a visitor car park on the mountain. From there the steep 2RN access road leads to the summit. This road is closed to normal traffic and 2RN have now fenced off the transmitter mast from public access to prevent vandalism. The Nine Stones and the car park lie on the saddle between Mount Leinster and the nearby Slievebawn (Sliabh Bán; ; ). There are in fact ten stones. They are arranged in a line and the largest is about high. The origin of the stones is uncertain. Other sports Cycling Mount Leinster has been used in stages of the Tour of Ireland and on many occasions in the FBD Insurance Rás (Rás Tailteann). It may be climbed from the Borris side in County Carlow or the Bunclody side in County Wexford. Ascending from Borris the climb is long and has an average gradient of 6.9%. The last are very tough reaching a gradient of almost 16%. Although the climb from Bunclody is slightly longer at its average gradient is 5.9%. The last of this climb is difficult with a gradient of 16.3%. The mountain is also used by The ML Syndicate (mountain biking club) who use the area for trail riding and MTB sporting events . Hang gliding The transmission site is a popular launch location for hang gliding and for radio-controlled gliders. In 2003, a hang glider pilot died from injuries sustained in the crash landing of his flight launched from the mountain. There is a memorial at the peak of the mountain. Plane Crash On Wednesday 7 September 1983 a Cessna 182Q Skylane light aircraft crashed below the summit while on a flight from Birmingham to Kilkenny. The four people aboard all died. Transmission site The Mount Leinster transmitter is owned and operated by 2RN and at ASL. It is the highest